JPS5534525A - Signal detection circuit - Google Patents

Signal detection circuit

Info

Publication number
JPS5534525A
JPS5534525A JP10652978A JP10652978A JPS5534525A JP S5534525 A JPS5534525 A JP S5534525A JP 10652978 A JP10652978 A JP 10652978A JP 10652978 A JP10652978 A JP 10652978A JP S5534525 A JPS5534525 A JP S5534525A
Authority
JP
Japan
Prior art keywords
pulse
time constant
specified frequency
charge
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP10652978A
Other languages
Japanese (ja)
Other versions
JPS5736790B2 (en
Inventor
Shuji Kunii
Mitsuo Masuda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tamura Electric Works Ltd
Original Assignee
Tamura Electric Works Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tamura Electric Works Ltd filed Critical Tamura Electric Works Ltd
Priority to JP10652978A priority Critical patent/JPS5534525A/en
Publication of JPS5534525A publication Critical patent/JPS5534525A/en
Publication of JPS5736790B2 publication Critical patent/JPS5736790B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M17/00—Prepayment of wireline communication systems, wireless communication systems or telephone systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Prepayment Telephone Systems (AREA)

Abstract

PURPOSE:To miniaturize the signal detection circuit which detects the AC signals of the specified frequency by converting the AC signal into the pulse signal and then applying the pulses to both the low-band and high-band setting circuits to the specified frequency for execution of the detection. CONSTITUTION:The DC signals supplied to reception circuit RC are changed to the pulse signals corresponding to the frequencies to which the pulse duration is fixed via two waveform circuits WF1 and WF2 to be applied to low-band and high- band setting circuits LS and HS. Circuit LS applies the output continuously to counter CT to give it the counting state by means of the charge/discharge means featuring the charge time constant smaller than the pulse duration of the pulse signal plus the discharge time constant larger than the cycle corresponding to the specified frequency. While circuit HS transmits the pulses to counter CT via the charge/ discharge means featuring the charge time constant smaller than the pulse duration and the discharge time constant smaller than the cycle corresponding to the specified frequency. Then counter CT produces the detection output when it counts the fixed pulse number.
JP10652978A 1978-08-31 1978-08-31 Signal detection circuit Granted JPS5534525A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10652978A JPS5534525A (en) 1978-08-31 1978-08-31 Signal detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10652978A JPS5534525A (en) 1978-08-31 1978-08-31 Signal detection circuit

Publications (2)

Publication Number Publication Date
JPS5534525A true JPS5534525A (en) 1980-03-11
JPS5736790B2 JPS5736790B2 (en) 1982-08-05

Family

ID=14435911

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10652978A Granted JPS5534525A (en) 1978-08-31 1978-08-31 Signal detection circuit

Country Status (1)

Country Link
JP (1) JPS5534525A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6471292A (en) * 1987-08-14 1989-03-16 Mitel Corp Dial tone detector
JPH04352502A (en) * 1991-05-30 1992-12-07 Matsushita Electric Ind Co Ltd High frequency filter

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60141679U (en) * 1984-02-29 1985-09-19 株式会社　広業社通信機器製作所 flat electromagnetic device
JPS61205280U (en) * 1985-06-13 1986-12-24

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4964313A (en) * 1972-10-20 1974-06-21

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4964313A (en) * 1972-10-20 1974-06-21

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6471292A (en) * 1987-08-14 1989-03-16 Mitel Corp Dial tone detector
JPH04352502A (en) * 1991-05-30 1992-12-07 Matsushita Electric Ind Co Ltd High frequency filter

Also Published As

Publication number Publication date
JPS5736790B2 (en) 1982-08-05

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